@jon when I had Tailscale (which uses Wireguard) on my old crappy NAS (1GB RAM, Annapurna Labs ARM CPU), I’d get a ton of issues with speed and some outright crashes so it’s definitely not as light as some other options. Could you go direct to the computer via WG instead? That presumably has CPU to spare.
@advancedrubbish if I had working IPv6 on both ends I absolutely could, unfortunately only my home end has IPv6 working. I do have a server I can put in the middle to relay traffic but I’m not at all confident it’ll help matters.
@advancedrubbish definitely worth investigating though, and if nothing else might rule out the problem being the router not being able to keep up.